Time's Macbook Air review

And they (the new Macbook Airs) run OS X Mountain Lion, a first-rate computer operating system that doesn’t suffer from the what-am-I identity crisis that Windows 8 (and the upcoming Windows 8.1) are still working through... I didn’t try to benchmark the new 13″ Air’s speed, but I will say this: In the week I’ve spent with the system, I’ve never found myself drumming my fingers and wishing it would do something faster than it did.
— TIME

I guess you do have to choose if you want to be a refrigerator or a toaster!